Recent content by student54321

Homework Statement A mass of 8.50 kg is traveling 7.50 m/s [up]. It is acted on by a force of 340 N [up] over a displacement of 15.0 m [up]. What is the change in kinetic energy Homework Equations Ek = 1/2mvsquared. F = mv. w = fd The Attempt at a Solution I tried doing the...

We round the electronegativity of lithium to 1.0, and bromide to 3.0, so the difference is actually 2.0. It is also ionic because it is a bond between a metal and non-metal.

Homework Statement People who are angry sometimes say that the feel as if they will explode. If a calm person with a lung capacity of 3.5L and a body temp of 36C gets angry, what will the volume of the persons lungs be if their temp rises to 39C. Homework Equations V1/T1 = v2/T2...

I fixed it, I did use 65m, just forgot to write that in. I am still getting 46m. 65=7.9t + 1/2a (t)^2 then I use this to solve for t: √2(d) divided by acceleration. Which gets me 3.64s. Then I do 3.64s * the horizontal velocity which is 12.72 = 46.3 m. Which is still wrong.

Now I'm getting 46m. I do: 65= 7.9(t) + 1/2a (t)^2 And I solve for t. Then I use the time I found and multiple that by the Vix. And then I get 46.228m, which is wrong.

Physics Projectile Launched at Angle. HELP, TEST TODAY IN 2 HOURS! Homework Statement An object is launched from the top of a building with an initial velocity of 15 m/s [32 degrees]. If the building is 65.0 m high, how far from the base of the building will the object land? Homework...

can anyone help?

Homework Statement A coin tossed straight up into the air takes 2.75 s to go up and down from its initial release point 1.30 m above the ground. What is its maximum height? Homework Equations The Attempt at a Solution I seriously have no clue how to do this problem. I...

Just thought about it. Is it because what goes up must come down? So it needs to be 2 times the time, I just calculated for the time to the top of the parabola. Am I right?

Homework Statement Jumping straight up, how long will a kangaroo remain in the air if it jumps through a height of 3.0m? Homework Equations d=vf(t) - 1/2 a (t)2 I Think? The Attempt at a Solution Defined all variable d=3.0 m a=9.81 m/ss vf=0m/s2 then: d=vf(t) - 1/2 a (t)2...

Homework Statement Some aircraft are capable of accelerations of magnitude 42.5 m/s2. If an aircraft starts from rest, how long will it take the aircraft to travel down the 2.6-km runway? Homework Equations d= vi(t) - 1/2 a(t)2 I am assuming that you need to solve for t. I had trouble...